1 files changed, 6 insertions, 0 deletions
diff --git a/hw/cirrus_vga_rop.h b/hw/cirrus_vga_rop.h
index 3d6a1fef1f..0079d12701 100644
--- a/hw/cirrus_vga_rop.h
+++ b/hw/cirrus_vga_rop.h
@@ -31,6 +31,12 @@ glue(cirrus_bitblt_rop_fwd_, ROP_NAME)(CirrusVGAState *s,
     int x,y;
     dstpitch -= bltwidth;
     srcpitch -= bltwidth;
+
+    if (dstpitch < 0 || srcpitch < 0) {
+        /* is 0 valid? srcpitch == 0 could be useful */
+        return;
+    }
+
     for (y = 0; y < bltheight; y++) {
         for (x = 0; x < bltwidth; x++) {
             ROP_OP(*dst, *src);